JPH06213159A - Compressor - Google Patents

Abstract

PURPOSE:To reduce the delay of opening/closing actions and improve the compression efficiency and the coefficient of performance by constituting a delivery valve device with a delivery valve coupled with a recess provided on a valve seat and a backer valve for regulating the opening of the delivery valve, and bending the backer valve in the opening direction of the delivery valve. CONSTITUTION:A delivery valve device is constituted with a T-shaped delivery valve 20 fitted into a recess 19 provided on a valve seat 15 and a T-shaped backer valve 21 regulating the opening of the delivery valve 20. The delivery valve 20 and the backer valve 21 are made of a thin elastic material, the backer valve 21 is set to be overlapped on one side of the delivery valve 20, and it is bent in the opening direction of the delivery valve 20 by the bend section 34 of a fixed section 33 side, the bend section 35 of a center section, and the bend section 37 of a free end section 36 side. Warp quantity H1 < warp quantity H2, and the free end section 36 is arranged in parallel with the delivery valve 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge valve device for a compressor.

[0002]

2. Description of the Related Art A conventional compressor discharge valve device is, for example, US
It is constructed as shown in P4723896. That is, in FIG. 11, 100 is a valve seat, and a discharge hole 101 is provided in this valve seat. 102 is a discharge hole 1
01 is a discharge valve for opening and closing, and this discharge valve is formed of a thin metal flat plate. Reference numeral 103 is a backer valve that regulates the opening of the discharge valve 102, and this backer valve is formed of a thin metal flat plate. Reference numeral 104 designates a pressing metal fitting for superimposing the discharge valve 102 and the backer valve 103 on the valve seat 100 and for restricting the displacement of the backer valve 103, and 105 a pressing spring for pressing the pressing metal fitting 104 with the cylinder head 106 against the cylinder 107. Is.

In this discharge valve device, the backer valve 103 is always kept in contact with the discharge valve 102 to regulate the opening degree of the discharge valve 102.

[0004]

However, according to the above configuration, since the discharge valve 102 and the backer valve 103 are in close contact with each other, the elastic force of the backer valve 103 closes the discharge valve 102 at the end of the compression process. Although the delay can be eliminated, at the start of the compression process, the discharge valve 102
There is a problem that the opening delay occurs due to the combined elastic force of the backer valve 103 and the backer valve 103. Further, the discharge valve device having the above-mentioned structure requires parts such as the pressing metal fitting 104 and the pressing spring 105, and there is a problem that the number of parts increases and the assembling work becomes complicated.

The present invention solves the above problems,
Improves the compression efficiency by reducing the delay in the opening / closing operation of the discharge valve,
An object of the present invention is to provide a compressor capable of improving the coefficient of performance and improving the assemblability of the discharge valve device.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a piston,
A cylinder on which the piston slides; a valve seat that seals the open end of the cylinder; a suction valve device that is mounted on the cylinder side of the valve seat; and a discharge valve device that is mounted on the opposite cylinder side of the valve seat. In a compressor including a cylinder head fixed to a valve seat via a gasket so as to cover the discharge valve device, the discharge valve device is a discharge valve fitted in a recess provided in the valve seat, and the discharge valve And a backer valve that regulates the opening of the valve, and the backer valve is bent in the opening direction of the discharge valve.

[0007]

The present invention is constructed as described above,
A stepwise gap can be formed between the discharge valve and the backer valve, and the discharge valve can be opened smoothly without causing the elastic force of the backer valve to act on the discharge valve at the start of the compression process. In addition, the elastic force of the backer valve can be applied to the discharge valve at the end of the compression process to prevent a delay in closing, and the delay in the opening / closing operation of the discharge valve can be reduced to improve compression efficiency. The coefficient can be increased. Further, according to the discharge valve device of the present invention, the discharge valve and the backer valve can be assembled simply by setting them on the valve seat, parts such as the presser spring are eliminated, the number of parts is reduced, and the assembling workability is improved. it can.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a hermetic compressor showing an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a state where the discharge valve and the suction valve are attached to the valve seat. FIG. 3 is a front view showing a state in which the discharge valve device is attached to the valve seat. FIG. 4 is a sectional view taken along the line AA of FIG. Figure 5
6 and 6 are a plan view and a front view showing an example in which three positions of the discharge valve are bent and formed. FIG. 7 is a sectional view of a discharge valve device showing another embodiment. 8 and 9 are a plan view and a front view showing an example in which one portion of the discharge valve is bent and formed. FIG. 10 is a graph showing the relationship between the warp amount of the discharge valve and the coefficient of performance (EER).

Reference numeral 1 denotes an airtight container, in which a frame body 2 and 3 consisting of two parts, a compression element 4 arranged on the upper side of the frame body, and an electric element 5 arranged on the lower side thereof. It is stored. The compression element 4 and the electric element 5 are elastically attached to the inner wall of the closed container 1 via a support device 6.

The electric element 5 includes a stator 8 having a winding 7 inside, a rotor 9 disposed inside the stator, and a bearing 10 of the frame body 2 inserted into the center of the rotor 8. And a rotary shaft 11 which is supported by.

The compression element 4 includes a cylinder 12, a piston 14 which is fitted in a crank pin 13 of a rotary shaft 11 and slides back and forth in the cylinder 12, a valve seat 15 provided on an end face of the cylinder 12, and a valve of this valve. And a cylinder head 16 attached to the cylinder 12 via a seat.

A suction valve device 17 is attached to the valve seat 15 on the cylinder 12 side, and a discharge valve device 18 is attached to the cylinder head 16 side. The suction valve device 17 is formed in a seat shape having substantially the same size as the valve seat 15. The discharge valve device 18 is composed of a T-shaped discharge valve 20 mounted in a recess 19 provided in the valve seat 15 and a T-shaped backer valve 21 that regulates the opening of the discharge valve. There is. The discharge valve and the backer valve are made of a thin elastic material, and the backer valve 21 has the discharge valve 20 as shown in FIG.
It is set to overlap on one side. Here, as shown in FIGS. 5 and 6, the backer valve 21 includes a bent portion 34 on the fixed portion 33 side, a bent portion 35 on the central portion, and a bent portion 37 on the free end portion 36 side. The bent portion is bent in the opening direction of the discharge valve 20, and the warp amount H2 is larger than the warp amount H1, and the free end portion 36 is set to be parallel to the discharge valve 20. It

Reference numeral 22 is a gasket interposed between the valve seat 15 and the cylinder head 16, and this gasket is provided with an extension portion 23 extending toward the fixed side of the discharge valve 20 and the backer valve 21. The cylinder head 16 has a valve seat 1
A protrusion 25 is formed so as to project to the 5 side. This protrusion is made by push molding. The discharge valve 20 and the backer valve 21 fix the cylinder head 16 to the cylinder 21 with bolts 26, so that the protrusion 25 of the cylinder head 16 and the valve seat 15 are provided via the extension 23 of the gasket 22.
It is sandwiched between and.

A discharge hole 27 is provided in the recess 19 of the valve seat 15 and is opened and closed by the discharge valve 20.

In the compressor thus constructed, the assembly sequence will be described. First, the valve seat 15 is set on the end surface of the cylinder 12 via the suction valve device 17. A discharge valve 20 and a backer valve 21 are set in the recess 19 of the valve seat. A gasket 22 is placed on the valve seat 15 in which the discharge valve and the backer valve are set. At this time, the extension portion 23 of the gasket is placed on the backer valve 21. Finally, the cylinder head 16
Is attached to the cylinder 12 with a bolt 26 via the valve seat 15. By mounting this cylinder head, the discharge valve 20 and the backer valve 21 are sandwiched between the projection 25 and the valve seat 15 via the extension portion 23 of the gasket 22.

Since the discharge valve 20 and the backer valve 21 are sandwiched between the projection 25 and the valve seat 15 via the gasket 22, the discharge valve 20 and the backer valve 21 are securely fixed by the elasticity of the gasket itself, and serve as a fulcrum during the opening / closing operation. The stress concentration on the side can be relaxed. Moreover, since the discharge valve 20 and the backer valve 21 are attached by being sandwiched between the valve seat 15 and the cylinder head 16, a fixing bolt or the like is unnecessary,
Workability can be improved.

Further, a stepwise gap 40 can be formed between the discharge valve 20 and the backer valve 21, and the elastic force of the backer valve 21 is exerted on the discharge valve 20 by the gap 40 at the start of the compression process. The discharge valve 20 can be opened smoothly without acting, and at the end of the compression process, the elastic force of the backer valve 21 can be applied to the discharge valve 20 to prevent a delay in closing, and It is possible to reduce the delay of the opening / closing operation, improve the compression efficiency, and increase the coefficient of performance. Further, according to the discharge valve device of the present invention, the discharge valve 20 and the backer valve 2 are attached to the valve seat 15.
It can be assembled simply by setting 1, and the conventional parts such as the pressing spring can be eliminated, the number of parts can be reduced, and the assembling workability can be improved.

7 to 9 show another embodiment,
The backer valve 51 is bent and formed in the opening direction of the discharge valve 20 at one bent portion 53 on the fixed portion 52 side, and the warp amount H is set such that the angle α is 0 to 30 °. It is a thing. In this case as well, the same operational effects as those having the above-mentioned three bent portions are obtained.

According to the present invention, as shown in FIG. 10, it has been experimentally confirmed that the same coefficient of warpage improves the coefficient of performance (EER) in three-point bending as compared to one-point bending.

[0021]

As described above, according to the present invention, a gap can be formed between the discharge valve and the backer valve, and the elastic force of the backer valve is generated by the gap at the start of the compression process. It is possible to open the discharge valve smoothly without acting on the discharge valve, and at the end of the compression process, the elastic force of the backer valve can be applied to the discharge valve to prevent a delay in closing, and the opening and closing operation of the discharge valve can be prevented. The delay can be reduced, the compression efficiency can be improved, and the coefficient of performance can be increased. Further, according to the discharge valve device of the present invention, the discharge valve and the backer valve can be assembled simply by setting them on the valve seat, parts such as the presser spring are eliminated, the number of parts is reduced, and the assembling workability is improved. it can.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a hermetic compressor showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a state in which a discharge valve and a suction valve are attached to the valve seat of the present invention.

FIG. 3 is a front view showing a state in which a discharge valve device is attached to the valve seat of the present invention.

FIG. 4 is a sectional view taken along the line AA of FIG. 3 of the present invention.

FIG. 5 is a plan view showing a backer valve of the present invention.

FIG. 6 is a front view showing a backer valve of the present invention.

FIG. 7 is a cross-sectional view of a discharge valve device showing another embodiment.

FIG. 8 is a plan view of a backer valve showing another embodiment.

FIG. 9 is a front view of a backer valve showing another embodiment.

FIG. 10 is a graph showing the experimental results using the backer valve of the present invention.

FIG. 11 is a sectional view of a discharge valve device showing a conventional example.

[Explanation of symbols]

 12 cylinder 14 piston 15 valve seat 16 cylinder head 17 suction valve device 18 discharge valve device 19 recess 20 discharge valve 21 backer valve

Claims (1)

[Claims] 1. A piston, a cylinder on which the piston slides, a valve seat that seals the open end of the cylinder, a suction valve device attached to the cylinder side of the valve seat, and an anti-cylinder side of the valve seat. In a compressor provided with a discharge valve device to be mounted and a cylinder head fixed to a valve seat via a gasket so as to cover the discharge valve device, the discharge valve device is fitted in a recess provided in the valve seat. A compressor comprising a combined discharge valve and a backer valve that regulates the opening of the discharge valve, wherein the backer valve is bent in the opening direction of the discharge valve.